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PMID: 1903539 Published · ppublish English Journal Article

Modulation of transcription factor NF-kappa B binding activity by oxidation-reduction in vitro.

Toledano MB, Leonard WJ

Abstract

NF-kappa B is a widely used regulator of inducible and tissue-specific gene control. In the cytosol, when complexed to an inhibitory molecule, I kappa B, NF-kappa B is in an inactive form and cannot bind DNA. Activation of cells with appropriate stimuli results in the dissociation of NF-kappa B from I kappa B and its translocation to the nucleus as an active binding protein. We now demonstrate that NF-kappa B binding in vitro can be inhibited by agents that modify free sulfhydryls. Binding is eliminated after treatment with N-ethylmaleimide, an alkylating agent, and diamide, an oxidizing agent. The diamide effect can be reversed by 2-mercaptoethanol. Further, 2-mercaptoethanol acts synergistically with deoxycholate plus Nonidet P-40 in converting inactive cytosolic NF-kappa B to an active DNA-binding form. It is therefore possible that modulation of the redox state of NF-kappa B could represent a post-translational control mechanism for this factor.

MeSH Terms
Cell Nucleus/metabolism Cytosol/metabolism DNA/metabolism DNA-Binding Proteins/metabolism Deoxycholic Acid/pharmacology Diamide/pharmacology Drug Synergism Ethylmaleimide/pharmacology Humans Mercaptoethanol/pharmacology NF-kappa B/chemistry,metabolism Nuclear Proteins/metabolism Octoxynol Oxidation-Reduction Polyethylene Glycols/pharmacology Proto-Oncogene Proteins c-jun Serum Response Factor Sulfhydryl Compounds/chemistry Transcription Factors/metabolism Tumor Cells, Cultured
Chemicals
DNA-Binding Proteins NF-kappa B Nuclear Proteins Proto-Oncogene Proteins c-jun Serum Response Factor Sulfhydryl Compounds Transcription Factors Deoxycholic Acid Diamide Polyethylene Glycols Mercaptoethanol Octoxynol DNA Nonidet P-40 Ethylmaleimide
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Toledano M B
Cell Biology and Metabolism Branch, National Institute of Child Health and Human Development, National Institutes of Health, Bethesa, MD 20892.
Leonard W J
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Article Info
Journal
Proceedings of the National Academy of Sciences of the United States of America
Abbr.
Proc Natl Acad Sci U S A
ISSN
0027-8424
Published
1991-05-15
Pages
4328-32
Language
English
Region
United States
NLM ID
7505876
PMCID
PMC51652
Subset
IM
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